Not much I can add to what other folks posted, I like rayon, it's cheap and works well once you learn the tricks, stuff it tight and thin the heck out of the tails, I thin down to 30%, Trim the tails so the just cover the juice holes, want just enough to keep the atty from leaking and try to keep the fibers from getting twisted, keep them straight through your bends. Think of the fibers as tubes the juice will flow through, but the juice flows along the outside of the fibers. One trick I found works well, I trim wick on the top side so the remaining tails are on the bottom of the coil, this way I'm not folding over the cut ends, less bulk then folding over the cut ends. It makes it easier to keep the fibers aligned and if I have over stuffed the coil I can pull a few fibers out using tweezers without disturbing anything, remember with rayon more is better when wicking, then less is better when trimming the tails.
How long the coil will last will depend mainly on the juice you use, I love Uncle Junk's Jon Wayne, it has been my main flavor for many years, it's made from natural flavors and will gunk a coil in two days. I have other fruit flavor's jices that are made from synthetic flavoring which are clear as water and those coils last weeks. Bottom line for me, as soon as the wick gunks I rebuild, new coils and wicks. I never try to clean a coil, wire and rayon are cheap when bought in bulk and it only takes five minutes to rebuild a dual coil atty, plus nothing beats the flavor and vapor cloud of a new build. I won't drink day old coffee, old soda or eat stale bread, why vape on a dirty, under preforming and poor tasting build? Life is to short to vape on a dirty build, you deserve the best vape you can get!
Last thought, I vape because I devolved a nasty lung infection that put me in the hospital for a week some years ago, at that time I was still smoking. I came away from that barley able to walk from one end of the house to the other without loosing breath, it took me four months to return to semi-normal breathing. The doctors told me I would likely have to live on inhaler's with COPD and if I didn't find a way quit smoking it would kill me within short order. That's when I started vaping, a year after vaping my lungs were clear and no more breathing problems. All was good until three years ago when my voice became hoarse, I had no cold or flu and it didn't go away, that's when they found a small tumor on my vocal cord, it was cancer. After radiation treatments I've been cancer free, now I'm very concerned about keeping my vaping as safe as it can be, I have switched to vaping TC (temperature control). I now only use Evolv boards, the DNA's boards, I feel they are the best TC boards out there. Evolv has been striving to make their TC boards the safest they can be, they are currently doing some lab testing and the preliminary results show once you go over 470 deg F the production of formaldehyde skyrockets at levels much higher then smoking. There is also talk that vaping on a gunked coil also increases the nasty's, that is the primary reason I rebuild with a new coil and wick as soon as I see it's gunked, second reason is of course I always get a great vape!
And just a bit of info, when I was seen by the first oncologist I asked him if I had harmed myself by vaping, he told me no, it was all the years of smoking, vaping didn't cause my cancer. I got a second opinion from another oncologist and he told me the same thing. They also both told me I could continue to vape during my treatments and I did, I had to go for the radiation treatments every day for six weeks. I would vape during the drive on the way to get the treatment, when done walk back to my car and pick up my mod and start vaping again. I was hoping they were right, and they were, the cancer is gone and I never slowed on my vaping all through the treatments and I'm a chain vaper so don't ever let anyone tell you vaping causes cancer! But, know that vaping is not 100% safe, yes it is much less harmful then smoking but I would urge everyone, make your vape as safe as you can and vape on!
